You can set a limit on the transactions that transfers apply to. For example, you can exclude transactions of more than $500. A minimum balance requirement can also be applied so that no money is transferred if your balance is low, protecting you from costly overdraft fees. And you can link to an account at any bank.

The app has been saving the average user about $350 per month since launching in May, according to the company. So far, 1,000 users have signed on. -- Blake Ellis